a(n) = n^5 - 2n.

Terms

a(0) =0a(1) =-1a(2) =28a(3) =237a(4) =1016a(5) =3115a(6) =7764a(7) =16793a(8) =32752a(9) =59031a(10) =99980a(11) =161029a(12) =248808a(13) =371267a(14) =537796a(15) =759345a(16) =1048544a(17) =1419823a(18) =1889532a(19) =2476061a(20) =3199960a(21) =4084059a(22) =5153588a(23) =6436297a(24) =7962576a(25) =9765575a(26) =11881324a(27) =14348853a(28) =17210312a(29) =20511091